Ion-selective Marangoni instability--chemical sensing of specific cation for macroscopic movement.
Ion-selective Marangoni instability--chemical sensing of specific cation for macroscopic movement.
复制标题
离子选择性马兰戈尼不稳定性——特定阳离子的化学传感以进行宏观运动。
作者：
T. Miyaoka;Junya Nishimura;Y. Iida;Syungo Maki;A. Shioi
当含有阴离子表面活性剂磷酸二（2-乙基己基）酯的油相与含阳离子的水接触时，观察到油/水界面响应于特定阳离子Ca（2+）或Fe（3+）的自发运动和张力振荡。这两种动力学都是Marangoni不稳定性的结果。阴离子表面活性剂与阳离子表面活性剂之间的络合物形成导致了不稳定性。显示阳离子萃取水平和界面张力程度的结果表明，表面活性剂-阳离子组合形成具有降低的表面活性的油溶性复合物。布鲁斯特角显微镜观察表明，复合物的分子倾向于聚集在界面处。这种聚集影响了络合物的脱附速率。我们能够产生离子选择性的不稳定性，通过施加机械和电化学扰动的平衡界面。从这些努力的结果表明，聚集是一种类型的热力学转变，是需要的不稳定的发病：解吸可能发生的剥离的聚集复合物，这产生了梯度的界面张力。对于两相接触的标准实验，两个相邻的界面流压缩它们之间的局部界面。我们认为，这种压缩提供了机械功的局部界面，导致解吸的聚集体和不稳定的发生。在特定阳离子的存在下，络合物的形成和聚集都是可能的。界面通过化学和热力学过程检测阳离子，以产生宏观运动，这是油/水界面的仿生运动形式。
Spontaneous motion and tension oscillation of an oil/water interface responding to specific cation Ca(2+) or Fe(3+) were observed when the oil phase containing the anionic surfactant bis(2-ethylhexyl) phosphate came in contact with the cation-containing water. Both the dynamics were the results of Marangoni instability. Complex formation between the anionic surfactant and cation caused the instability. The results showing the level of cation extraction and degree of interfacial tension revealed that the surfactant-cation combination forms an oil-soluble complex with reduced surface activity. Brewster angle microscopy indicated that molecules of the complex tend to aggregate at the interface. This aggregation affected the desorption rate of the complex. We were able to generate ion-selective instability by imposing mechanical and electrochemical perturbations to the interface at equilibrium. The results from these efforts suggested that the aggregation is a type of thermodynamic transition and is required for the onset of instability: Desorption probably occurs as an exfoliation of the aggregated complex, which generates the gradient of interfacial tension. For the standard experiment of biphasic contact, two neighboring interfacial flows compress the local interface between them. We considered that this compression provides mechanical work to the local interface, resulting in desorption of the aggregates and occurrence of instability. Both complex formation and aggregation are possible in the presence of the specific cation. The interface detects the cation via the chemical and thermodynamic processes in order to develop the macroscopic movement, a form of biomimetic motion of the oil/water interface.
使用烷基硫酸钠系统直接观察水/硝基苯界面的化学振荡
DOI：
--
发表时间：
2004
期刊：
ANALYTICAL SCIENCES 20
影响因子：
--
作者：
Ikezoe Y;Ishizaki S;Yui H;Fujinami M;Sawada T.
通讯作者：
Sawada T.
液滴运动的离子控制
DOI：
--
发表时间：
2006
期刊：
Chemistry Letters 35
影响因子：
--
作者：
清水紀芳;小泉直也;杉本麻樹;新居英明;関口大陸;稲見昌彦;伴 貴彦
通讯作者：
伴 貴彦